Massage gun



FIG. 1 is a perspective view of a massage gun showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict portions of the massage gun in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a massage gun, as shown and described. 